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Marine Plug Valve

Marine Plug Valve

Marine Plug Valve is a type of quarter-turn rotary valve designed for controlling and isolating fluid flow in ship piping systems.

The valve uses a rotating plug inside the valve body to open, close, or regulate the flow passage. By rotating the plug 90 degrees, the valve can quickly switch between fully open and fully closed positions.

Marine Plug Valve is widely used in:

  • Ship seawater systems

  • Cooling water systems

  • Ballast systems

  • Fuel oil systems

  • Bilge systems

  • Cargo piping systems

  • Marine auxiliary systems

With a simple structure, reliable sealing performance, and easy operation, Marine Plug Valve is suitable for various marine piping applications.

Overview

Working Principle of Marine Plug Valve

Marine Plug Valve controls fluid flow through the rotation of a tapered or cylindrical plug inside the valve body.

Operating Process:

  1. The operator turns the handle or operating mechanism.

  2. The plug rotates 90 degrees inside the valve body.

  3. The flow passage aligns with the pipeline direction.

  4. Medium passes through the valve.

  5. When rotated back, the plug blocks the flow passage.

  6. The valve achieves complete shut-off.

Main Components of Marine Plug Valve

ComponentFunction
Valve BodyMain pressure-containing structure
PlugRotating element controlling flow
Valve CoverProtects internal components
StemTransfers operating movement
Seat / Sealing RingEnsures sealing performance
Handle / Gear OperatorProvides valve operation
PackingPrevents stem leakage
GasketEnsures connection sealing
FastenersSecures valve assembly

Applicable Standards of Marine Plug Valve

Standard CategoryApplicable Standards
Marine Valve StandardsJIS F Series Marine Valve Standards
Chinese Marine StandardsGB/T Marine Valve Standards
Shipbuilding StandardsCB/T Standards
Plug Valve StandardsAPI 599 / API 6D
Flange StandardsJIS B2220 / GB/T / DIN EN 1092 / ANSI B16.5
Pressure Testing StandardsAPI 598 / ISO 5208
Classification RequirementsCCS, ABS, DNV, LR, ClassNK

Material Selection of Marine Plug Valve

MaterialFeaturesApplications
BronzeExcellent seawater corrosion resistanceSeawater systems
Cast IronEconomical and durableGeneral marine piping
Cast SteelHigh strength and pressure resistanceHeavy-duty systems
Stainless SteelExcellent corrosion resistanceOffshore and chemical environments
Aluminum BronzeSuperior seawater resistanceMarine applications

Common Material Standards

MaterialStandard
BronzeJIS H5120 BC6 / ASTM B62
Cast IronASTM A126
Cast SteelASTM A216 WCB
Stainless SteelASTM A351 CF8M
Aluminum BronzeASTM B148

Technical Specifications of Marine Plug Valve

ItemSpecification
Product NameMarine Plug Valve
Valve TypeRotary Plug Valve
Operation TypeQuarter Turn
MediumSeawater, Fresh Water, Oil, Air
Connection TypeFlanged / Threaded
Size RangeDN15-DN300
Pressure RatingPN6-PN40
Plug TypeCylindrical / Tapered Plug
Material OptionsBronze, Cast Iron, Cast Steel, Stainless Steel
ApplicationMarine Piping Systems

Pressure Test of Marine Plug Valve

Test ItemDescription
Shell Hydrostatic TestVerifies valve body strength
Seat Leakage TestChecks sealing performance
Pressure Holding TestConfirms pressure resistance
Operation TestEnsures smooth plug rotation
Material InspectionConfirms material specification
Dimensional InspectionEnsures installation accuracy

Advantages of Marine Plug Valve

FeatureBenefit
Quarter-turn OperationFast opening and closing
Simple StructureEasy maintenance
Reliable SealingReduces leakage risk
Corrosion-resistant MaterialsSuitable for marine environment
Compact DesignSaves installation space

Typical Applications

ApplicationFunction
Seawater SystemControls cooling water flow
Ballast SystemControls ballast water pipelines
Bilge SystemControls drainage pipelines
Fuel Oil SystemControls oil flow
Cargo SystemProvides isolation control
Marine Auxiliary SystemControls fluid circulation


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